Lathe.



. APPLICATION FILED MAY 3, 1902.

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PATBNTED APRyzs, 190s.'

' B. M. w. HANsoN.

LATHE.

- APPLIOATION FILED Mn 3. 1902.

N0 MODEL.

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No. 726,678. PATENTED APR. 28, 1903.

B. M. W. HANsoN. Y

LATHE.

APPLICATION FILED MAY 3.11902.

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Nrrn STATES" ATENT Prion.

BENGT M. HANSON, OF HARTFORD, CONNECTICUT, ASSIGNOR TO PRATT da WHITNEY COMPANY, O-F HARTFORD, CONNECTICUT, A CORPORATION OF NEV JERSEY.

LATH E.

SPECIFICATION forming part of Letters Patent N o. 726,678, dated April 28, 1903.

Application filed May 3, 190/2. Serial No. 105,839. (No model.)

To all whom t may concern:

Beit known that I, BENGT M. W. HANsoN, a subject of the King of Sweden and Norway, residing atHartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Lathes, of which the following is a specification.

My invention relates to mechanism for stopping and reversingthe carriage of a lathe or to other metal-working machine, and has for its object the provision of means for enabling the live-spindle to continueY its rotary movement without actuating lthe train of gearing which'imparts motion to the lead screw and z5 feed-rod when it is desired to perform the operationsof filing or bnrnishing.

A further object of the'invention isthe provision of mechanism which will'enable the work to be turned close up to'a shoulder or zo projection and yet will assure such limitation of the movement of the carriagethat there Will be no danger of breaking the tool carried in the slide-rest thereof.

A further object of the invention is the pro-|A z5 vision of mechanism adapted to stop the"l movement of the carriage automatically in either direction, thereby obviating all danger of running the tool into the bottoms of holes in boring or internal thread-cutting.

A further object of the invention is the provision of a stopping and reversing mechanism for lathes which will enable duplicate parts to be accu rately formed,therefore necessitating but one measurement for the kind of work being produced.

Other objects of the invention will be set forth in the detailed description which now follows. v

In the accompanying drawings, Figure 1 is 4o a side elevation of a portion of a metal-working machine shown as a lathe with my improvements applied thereto. Fig. 2 is an end elevation of the same. Fig. 8 is alongitudinal vertical section of the head of alathe having my improvement. Fig. et is a horizontal section of the bracket in which the shipperrod is mounted. Fig. 5 is an end View of the shipper-fork shown in Fig. 3. Fig. 6 is an elevation, partially in section, of the mech- 5o anism for throwing the feed-gearing out of action when it is desired to rotate the spinperspective View of the clutch mechanism.

dle without reciprocating the carriage. Fig. 7 is a side elevation of one of the adjustable stop-carriers carriedby the shipper-rod. Fig. 8 is a front elevation of said stop-carrier. 55 Fig. 9 is au elevation of the Worm-gear and hand-wheel which give reciprocatory movement to the shipper-rod when'it is desired to move the latterv manually. Fig. 10is an end view of an idler-pinion and ashiftable sleeve 6o embodied in the reversing mechanism. Fig. 11 is a detail View ofthe idler-pinion and its stud and the shiftable sleeve, a portion of the headl being shown in section; and Fig. 12 is a Likecharacters designate similar parts throughout the several views.

Referring to the drawings, the numeral l designates the bed or frame of the machine, having the shears 1 and the puppet-head 2 7o in the vertical standards 2',-of which the back gearing A, cone orstepped pulley B, andlivespindle C,'Vcarrying face-plate D and center E are supported, all of these parts being of lcommon construction, and therefore requiring no further description.

Designated by the numeral 5 is a carriage movable upon the shears l of the lathe-bed, saidcarriagehaving a dependingportion 5', provided 'with a bearingl'z, in which is jour- 8o naled the shaft 6 of a hand-wheel 6, the inner end of said shaft carrying a Worm-Wheel 7, whose teeth engage a thread formed on the shipper-rod 9.

Depending from the bearing 52, carried by the apron of the lathe-carriage, is a lug 10, and mounted on theshipper-rod 9,- one at'each side of said lug, are split carriers 12 12', respectively, each comprising a body'port'ion 85, in the lower ends of which are fitted ad- 9o justable screws or stops 122, threaded into bearings 86 of said carriers andcapable of being locked in position 'against displacement by lever-nuts 125, as illustrated in Figs 1 and 8. As above stated, each of these carriers is split, and the shipper-rod 9' passes through an opening located at the end of and communieating with the slot in the carrier, a screw a, having a handle b, being employed for drawing the split portions of the carrier together rco and clamping the same upon the shipper-rod. This shipper-rod subserves a purpose hereinafter mentioned, is mounted at one end in a bracket 13, is slidingly supported in a bearing (not shown) in a portion of the lathe-bed 1, and is recessed at 14 (see Fig. 4) for the reception of a plate 15, provided with V or other shaped notches 16 to receive the end of a spring-actuated plunger 18. The stem of this plunger is fitted in an opening of the bracket, and a spring 19, carried in a recess 20 of said bracket, bears against the head 1S thereof, a plug 21 being threaded into said recess and serving to alter the tension of the spring when necessary.

Designated by the numeral 22 is a rockshaft which is jonrnaled in a bearing 22 of the lathe-bed and is provided at its outer end with an arm 23, furcated at 23 for the reception of a pin 25, carried by the shipper-rod 9. At its inner end the rock-shaft is provided with a vertical arm 2G, fnrcated at 26 for the reception of a pin 27, carried by a sliding rod 2S, mounted in a bracket 29 of the frame, said rod carrying at its opposite end a shipper-fork 30, the arms of said fork being provided with inwardly-projecting pins 30' 302, Figs. 3 and 5, located in the space between a pair of collars 3l 3l of the clutch-shifting rod :for a purpose hereinafter described.

Coming now to the stopping and reversing mechanism employed, there is shown connected to the live-spindle C a gear-wheel 34, and at the outer end of said spindle is a gearwheel 35 of smaller diameter, both of said gearwheels being fast upon the spindle, which is threaded at 3G for the reception of a split ring or collar 37, the latter being recessed at 37' to afford greater resiliency to said collar, which is designed to provide means for taking up lost motion of the spindle.

Located in a bearing 40 of the trame is a shiftable sleeve 41, in which are mounted the hubs of gear-wheels 42 and 43 of different diameters, the gear 42 being in mesh with the gear 34, while gear 43 engages an idlerpinion 44, which in turn intermeshes with the gear 35. Fitted in the hubs of the gearwheels 42 and 43 is a shaft 45, having a collar 45 at one end and nuts 452 at the oppoposite extremity, upon which is keyed at 46 the gear 47, which through a common train of gearing 4S (see Fig. 1) imparts motion to the lead-screw 49 and feed-rod 50 to reciprocate the carriage in the usual manner.

The shaft 45 is provided with a longitudinal bore for the reception of the clutchshifling rod 5l and is slotted at 52 to permit said rod to be positively connected toa shiftable clutch 53 by a pin 54., said clutch being keyed or otherwise fastened to the shaft 45 and carryingr single teeth 55 55', respectively,

one upon each of its faces, the tooth 55 being designed to engage a similar tooth 5U, carried upon the inner face of the hub of the gear-wheel 42, while the tooth 55 engages, as shownin Fig. 3, a tooth 43', carried in like manner by the hub of the gear-wheel 43.

Mounted transversely of the bearing 40 is a shaft 60, provided at its inner end with gear-teeth Gl, which mesh with the teeth of a rack 62, formed upon the shiftable sleeve 41, said shaft being provided atits outer end with a crank G3, which is recessed at G4 for the reception of a spring-actuated plunger (i5, carrying a knob (i6, as best illustrated in Fig. 6, the lathe head-stock being provided with a slot7,in which the end of said plun- Vger is designed to travel, recesses 68 for the reception of the plunger being vprovided at each end of the slot at the limit of stroke of said crank to secure it against accidental movement.

The idler-pinion 44 is mounted for sliding movement upon a stud 69, carried by the frame, as illustrated in Figs. 3 and 11, said pinion being connected to the shiftable sleeve 41 through the medium of a pin 70, (see Figs. 3, 10, and 11,) the lower extremity of which is secured to said sleeve, while its upper end rests in a groove 7l of the hub of the pinion 44.

From the above description it will be seen that the livespindle C may rotate continuously, and yet the proper reciprocatory feed movement will be imparted to the carriage on which the tool slide-rest is mounted.

1n the embodiment of my invention illustrated the operation is as follows: Vhen it is desired to employ the lathe for screw-cutting purposes, the clutch 53 is shifted to the left, and its single tooth 55' engages the like tooth 43 on the end of the hub of the gearwheel 43. Power now beinga-pplied to the livespindle by abeltengaging the desired stepped portion of the cone-pulley B, the gears 35 43 44 47 and the gear-train 48 are set in inotion, and the feed-screw 49, which operates in the usual divided nut (not shown) of the lathe-carriage, will be turned to actuate said lathe-carriage and cause the cutter H, carried in the tool-post G of the slide-rest F to reciprocate longitudinally of the work at the speed determined by the element of the geartrain 4S in use. Before the thread-cutting operation commences the stop carriers 12 and 12' are adjusted to such positions upon the shiftable rod 9 that when the carriage reaches the limit of movement toward the left to which it is desired to travel the lug 10 will come into contact with the stop 122 of the stop-carrier 12] and will shift the rod 9 to the left and through the pin 25, arm 23, rockshaft 22, arm 26, and pin 27 the sliding rod 28 to the right, the shipper-fork 30 acting when this is done to move the clutch-shifting rod 51, and consequently the clutch 53, also to the right, thereby withdrawing the tooth 55' from contact with the tooth carried by the hub of the gear 43. When this has been accomplished, said gear will rotate idly upon the shaft 45 and consequently the clutch 53 being in a neutral position the motion of the lead screw will cease, although the spindle C will continue to rotate, the tool cutting a groove in the stock at the end of the thread.

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shaft 6, will by its rack-and-pinion engage-` ment with rod 9 cause said rod to be shifted still farther to the left,which will, through the connections before described, shift the clutch 53 farther to the right and carry its tooth 55 into engagement with the tooth 56 upon the inner face of the hub of the gear-wheel 42.

When this is done, the motion transmitted to the lead-screw through gear-wheel 34, gearwheel 42, clutch 53, shaft 45, gear 47, and gear-train 48 will be to the left, or opposite to the motion transmitted to said lead-screw when the clutch is in engagement with the gear 43, and consequently the carriage will be returned to the right, the lug 10 acting against the stop 122 of stop-carrier 12 when the carriage has reached the end of'its movement to cause the rod9 to be shifted to the right, thereby moving the clutch 53 to the left, and thus disengaging it from the gear 42, which will then rotate idly without imparting motion to the shaft 45. At times it is desirable to return the carriage by hand through the medium of the wheel 80, the shaft of which carries a pinion in engagement with the usual rack on the latl1ebed,lsaid' devices being common in machines of this character, and hence unnecessary to illustrate. Heretofore it has been necessary after acut in forming a thread has been made and the carriage has been returned by hand preparatory to making another cut to stop the live-spindle and adjust the tool to the thread before spindle C rotates and the rate ofspeed at` which the carriage travels, this relation being varied by the gear speed train according to the pitch of the thread it is desired to form.

Consequently if the clutch is automatically thrown out of engagement at the end of the forward movement of the carriage and the carriage is then returned by hand preparatory to the adjustment of the tool for a new cut it is obvious that if the clutch is again shifted to the left at a time when the kthread being formed is not in position to receive the tool its single tooth will bein such position that it will not at once engage the single tooth on the hub of the gear-wheel 43, and therefore no movement ot' the carriage will follow until the stock is turned around far enough to insure its proper relation to the tool, be-

cause the clutch 53 and the shaft 45 have remained stationary while the carriage was being returned, and as the clutch, as above stated, carries but one tooth upon each of its faces that tooth retains a certain position, and when the tooth carried by the gear-wheel 43 comes to the positionit held at the time the clutch was thrown out of engagement at the endofsaid forward movement of the carriage it engages the clutch and sets the feed mechanism in operation. In virtue of, this construction it is therefore not necessary to stop the spindle when the carriage resumes its forward movement to make the succeeding' cuts, for the clutch-tooth 55 being in the same position it follows that the spindle will also be in like position, and consequently the stock will receive the tool at the proper moment to continuethe thread-forming operation. lt is obvious that the forward movement of the carriage will, cause the handwheel 6, through the engagement of the wormgear carried by said wheel with the thread formed on the shiftable rod 9, torotate continuously, and to prevent said rod from being shifted by the friction thus engendered the detent shown in Fig. 4 is employed, and from the description hereinbefore given it will be seen thatsaid detent will act to hold the rod in position until positive movement-is given the same by turning the hand-wheel with sufficient force to overcome the pressure of the spring 19 or by the action of the lug 10 against the stops 122 to accomplish thel same result.

When filing or burnishing work, it is desirable that in order to reducethe noise and friction the train of gearing for rotating the lead-screw and feed-rod should remain stationary, and to accomplish this result the crank 63 is swung to the leftin Fig. 1, the plunger 65 entering the recess 68 at the eX- treme left of the slot 67to retain thecrank in such position, said movement of thecrank partially rotating the shaft 60, which, will, through the pinion 61 meshing with the rack 62, cause the sleeve 41, gear-wheels 42 .and 43, pin 70, and through saidvpin the idler-,pinion 44 to be shifted to the left, (see Figs. 3 and 11,) which will throw said gear-wheels42 and 43 out of mesh with thev gear-wheelsv 34`and.

35, and thus permit, the spindle C to rotate without imparting motion to any of the mechanism excepting said gear-wheels 34and-35r.

To permit this movement, the inner face of gear 42 is chambered at 42', and a recessOO for the reception of said gear is formed in th head 2as shown in Fig. 3. n 3 1 When adjustment of the'st'op-carriers 12- and 12 is'required, they are moved lbodily upon the shiftable rod 91until the approximate adjustment is secured and` are Vthen clamped in position by the screw a, afterV which a more exact adjustment is secured, if

necessary, by the stop-screws 122, which are' IIO stopping and reversing mechanism it is possible to insure any desired limitation of the movement of the carriage when boring or in cutting internal screw-threads, thereby obviating all danger of breaking the tool by running into the bottoms of holes, and that in duplicating parts but one measurement is required, for after the stop-carriers 12 12 are once set to the desired adjustment the movement of the carriage is exactly the same cach time it is fed forward, and consequently the tool Will perform exactly the same work.

My invention is not limited to the exact construction shown and described, nor to the kind of gearing employed, or its precise proportionate relation, but includes Within its purview other devices and modifications thereof capable of accomplishing the results set forth. Furthermore, the invention is not restricted to a metal-turning lathe, for it may be employed with other kinds of metal-working machines.

No claim is made to the details of the stopping and reversing mechanism of the livespindle head, excepting as they coact in combination with other elements of the machine, such details being covered by my divisional application, Serial No. 117,285, iiled July 28, 1902.

Having thus described my invention, what I claim is- 1. The combination, with a Vrotary spindle, of a tool-carriage; means for actuating said carriage; mechanism including a clutch for operating the carriageactuating means; a shifting-rod; stops on said rod; means connecting said rod with the clutch; a manuallyoperated gear carried by the carriage and serving to actuate the shifting-rod; and means for preventing displacement of the shiftingrod by said gear as the carriage reciprocates.

2. The combination, with a carriage, and with mechanism for reciprocating the same,

of a threaded rod for controlling said mechtool-carriage; 4a shifting-rod; means connecting said shifting-rod with the clutch; means controlled by the carriage for actuating said shifting-rod; a gear mounted in a bearing of the carriage and in engagement with said shifting-rod; and means for turning said gear and thereby actuating the shifting-rod, when it is desired to shift the clutch by hand.

4. The combination, with a carriage, and with means, including a clutch, for reciproeating said carriage, of a threaded rod carried by the frame; agear-wheel, the shaft of which is journaled in the carriage, said gear- Wheel being in engagement with the threaded rod; and a handle attached to the shaft of the gear-Wheel.

5. The combination, with a movable carriage, of a shiftable rod, a gear on the car riage in engagement with said rod; means for actuating the gearand thus shifting the rod; a bracket in which a part of the rod is mounted; means carried by the bracket for preventing movement of the rod While the gear rotates upon it during the normal movements of the carriage; and carriage-operating mechanism controlled by the rod.

6. The combination, with a carriage, of a shiftable rod; a Wheel on the carriage nor mally rotating idly on the rod; means for no1'- mally preventing displacement of the rod by said Wheel; means for actuating the wheel when it is desired to shift the rod; a clutch; means actuated by the rod for shifting said clutch; a spindle; and mechanism driven from the spindle, and including said clutch, for actuating the carriage.

7. The combination, With a traveling carriage, of a shaft journaled in a bearing of said carriage; a worm-Wheel carried on the inner end of said shaft; a hand appliance on the outer end of said shaft; a threaded rod with which said worm-wheel is in engagement; a notched plate secured to the end of said rod; a bracket in which the end of the rod is mounted; a spring-actuated detent carried by the bracket; and carriage-operatin g mech anism controlled by said rod.

In testimony whereof I affix my signature in presence of two witnesses.

BENGT M. W. HANSQN.

Witnesses:

H. E. BAILEY, J. J. MASON.

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